There is a stage one port of gentoo onto alpha(found in the downloads section), but there is no easy boot/installer as of yet. join #gentoo-alpha on irc.freenode.net where a couple of us are around sometimes. there is the person who did the stage one port currently working on a bootable installer disk, so hang in there.

Well, when I have got the time, I will check it out.
I still have an Alpha Server 2100, Quad-way 200Mhz with 1GB RAM system in the closet..
Just laying there..
I would be pleased to get it working on that machine..
It's almost as big as a fridge but who cares..

So I will try the stage 1 install & check it out..

We might be the ones writing the Alpha Install Manual though, but thats just to keep the others going.._________________All things considerring! I'm considerring to...never mind!

well, I don't believe there is an install manual yet, however you might check out https://forums.gentoo.org/viewtopic.php?t=15678 I've also emailed the one of the guys who has been doing some work on this, and got back this advice on getting it working:

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If you really want to get install-y, the simplest thing to do is to create a couple partitions, install a
minimal debian/redhat/whatever on one of them, get the .tbz2, follow the installation instructions starting with part 7 (mount partitions), mounting your free partition, extract the stage1 tarball onto the other partition, chroot, and go from there..
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by his description, I'm assuming by starting with part7 he means out of these instructions http://www.gentoo.org/doc/en/build.xml I'm going to be giving this a try soon, so I'll post here what I encountered. good luck!

Aaron_________________DISCLAIMER:
Anything I have posted may or may not be actual fact, take it as such and don't complain if what I say leads to a massive system vulnerability which gets hacked and your company has everything stolen and then nuked.